#include<stdio.h>

#include<math.h>

int jc(int arr[], int length)

{

int max = arr[0];

int min = arr[0];

for (int i = 0; i < length; i++)

{

if (max < arr[i])

max = arr[i];

if (min > arr[i])

min = arr[i];

}

return max - min;

}

double fc(int arr[], int length)

{

double sum = 0.0;

for (int j = 0; j < length; j++)

{

sum = sum + arr[j];

}

double avg =sum / length;

double sum1 = 0.0;

for (int j = 0; j < length; j++)

{

sum1 += pow(avg - arr[j], 2);

}

return sum1 / length;

}

int main()

{

int t;

scanf_s("%d", &t);

for (int i = 0; i < t; i++)

{

int num = 0;

scanf_s("%d", &num);

int arr[100];

for (int j = 0; j < num; j++)

{

scanf_s("%d",&arr[j]);

}

printf("%d %.3f\n", jc(arr, num), fc(arr, num));

}

return 0;

}